It has always been a dream of mine to have a choice of whether or not to traffic human or alien beings for sale in a game ever since growing up reading the Boba Fett novels or Lobo comics(the skinny one )

It can be implemented as a risk to morality and rep while providing the most income. It can add an element where other players have to safely disable your ship and board to free the slaves thereby making it a "safer" option for transport.

In other games and stories regular smugglers don't even realize they are transporting slaves such as Isabela, Boba Fett, and Lobo. When they discover the slaves they usually set them free and go on a run from their employer (Isabela from da2) or decides to honor the contract Boba Fett for honor, but kills the employer after mission or Lobo delivering the Aliens to be processed saying his new catchline "Sorry, not sorry" in order to find Fake Lobo.

By becoming a smuggler you should run the risk of having slaves secretly placed on your ship once you step into the business.